Frequency ranking derived from FrequencyWords by Hermit Dave (https://github.com/hermitdave/FrequencyWords),
built from OpenSubtitles 2018 (http://opus.nlpl.eu/OpenSubtitles2018.php). Word list content is licensed
CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). freq.txt here keeps only the ranking order of
words that are also in the dictionary list; it is an adapted work shared under the same licence.